Diameter of human eye lens is 2mm. What will be the minimum distance between two points to resolve them, which are situated at a distance of 50m from eye? [The wavelength of light is 5000 Å]

If f_v and f_n are the focal lengths of a convex lens for violet ad red light respectively and F_V and F_R are the focal lengths of concave lens for violet and red light respectively, then we have

Focal length of a convex lens of refractive index 1.5 is 2 cm. Focal length of lens when immersed in a liquid of refractive index of 1.25 will be

A body is located on a wall. Its image of equal size is to be obtained on a parallel wall with the help of a convex lens. The lens is placed at a distance d ahead of second wall, then the required focal length will be :

A convex lens is dipped in a liquid whose refractive index is equal to the refractive index of the lens. Then its focal length will

Which of the following phenomenon is not explained by Huygen's construction of wavefront?

Interference is possible in

Electromagnetic radiation of frequency v frequency, velocity v and wavelength λ, in air enters a glass slab of refracive index μ. The frequency, wavelength and velocity of light in the glass slab will be, respectively

The angular resolution of a 10 cm diameter telescope at a walength of 5000 Å is of the order of

A lens is placed between a source of light and a wall. It forms images of area A₁ and A₂ on the wall, for its two different positions, the area of the source of light is